Sagi, 43, bought Camden Market for £500m in 2014 and floated it as Market Tech. He has a £747m stake. The Israeli's fortune comes from the gaming software business Playtech, where he has an £840m stake. He sold a 15% holding in 2014, raising £326m. Playtech spent £333m last year buying another Sagi company, TradeFX. Sagi owns property in Tel Aviv, London and Berlin.